The power supply and distribution system of the municipal water treatment plant is generally considered according to the secondary load standard. Generally, 10kV power supply is used to enter the line. According to the process layout, the substation provides power to various electrical equipment and power distribution boxes in a radiation manner. High-power equipment, mainly blowers, lifting pumps, etc., are generally started by frequency converters or soft starters; low-voltage and low-power equipment, including agitators, screw conveyors, coarse and fine grids, hoists, scrapers, etc., are often The power supply is divided by process, and non-process system equipment such as ventilators and cranes in the building are distributed by the power distribution box of the corresponding workshop.